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Revenues - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Aug. 31, 2020
Revenue from Contract with Customer [Abstract]          
Revenue recognized $ 19.9 $ 39.6 $ 91.6 $ 131.6  
Contract liabilities $ 783.2   $ 783.2   $ 139.1